Version 3.10.3

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc	(revision 11348)
+++ src/ia32/codegen-ia32.cc	(working copy)
@@ -397,9 +397,25 @@
   // Allocate new FixedDoubleArray.
   // edx: receiver
   // edi: length of source FixedArray (smi-tagged)
-  __ lea(esi, Operand(edi, times_4, FixedDoubleArray::kHeaderSize));
+  __ lea(esi, Operand(edi,
+                      times_4,
+                      FixedDoubleArray::kHeaderSize + kPointerSize));
   __ AllocateInNewSpace(esi, eax, ebx, no_reg, &gc_required, TAG_OBJECT);
 
+  Label aligned, aligned_done;
+  __ test(eax, Immediate(kDoubleAlignmentMask - kHeapObjectTag));
+  __ j(zero, &aligned, Label::kNear);
+  __ mov(FieldOperand(eax, 0),
+         Immediate(masm->isolate()->factory()->one_pointer_filler_map()));
+  __ add(eax, Immediate(kPointerSize));
+  __ jmp(&aligned_done);
+
+  __ bind(&aligned);
+  __ mov(Operand(eax, esi, times_1, -kPointerSize-1),
+         Immediate(masm->isolate()->factory()->one_pointer_filler_map()));
+
+  __ bind(&aligned_done);
+
   // eax: destination FixedDoubleArray
   // edi: number of elements
   // edx: receiver